Question [Security]: using AsyncStorage to store token about react-native-azure-auth

[oferRounds]

One good option IMO is to use: https://github.com/oblador/react-native-keychain

[vmurin]

Hi @oferRounds

• on one side you have referenced article about much more insecure localStorage not AsyncStorage ;)
• on other side you are absolutely right - AsyncStorage is unencrypted storage and if your device is stolen and has unencrypted disk some one can access the file system and read the values in store.
  But AsyncStorage is secure enough if you did not loos your device. It means - it can not be accessed from another app.
• I will consider to switch to more secure storage

[oferRounds]

Yes, you are right - I referenced it as related to storing token on a client in general, in an unencrypted way
I wasn’t aware that localStorage is a lot worse (Coming from the native mobile in my roots, not from the web)
Anyhow, thanks! Sounds good

[vmurin]

localStorage is a part of web browser API, it is not bound to any mobile app and there are many known attack ways to access data in localStorage, that does not meant to be accessible by anyone except owner.

In contrary AsyncStorage is a React Native feature backed under the hood by different native storage types on iOS and Android. It is not accessible from other apps, it is bound to your app, i.e. it will be cleared (the related part of it) if the app has being uninstalled.
So in a some way it is secure ;)

Anyway it is recommended to use something like react-native-keychain for a sensible data like tokens as you wrote.

Thanks for pointing this out!

[oferRounds]

Got you @vmurin, good to learn this info about the localStorage

And thanks for always welcoming the feedback!

[josethz00]

I read the discussion, and I think I will switch from AsyncStorage to Keychain, but I am concerned about performance. Is Keychain's performance similar to Async Storage?

[vmurin]

I did't googled for performance comparison between AsyncStorage and Keychain. But I suppose the performance in this case is not an issue. All network response times during auth process are much bigger.